Question

Find each union or intersection. Let A= {1, 3, 4}, B= {x | x is an even whole number less than 9}, C= {2,5,7,10}, and D= {x | x is an odd whole number less than 10}.

17. A ∩ C

Answer 1

so, the set B = {2, 4, 6, 8} (if the universe is positive integers)
Set D = {1, 3, 5, 7, 9}

A intersection C = { empty set}, (A and C have no elements in common)

Answer 2

If this asked us the union, then A union C = {1, 2, 3, 4, 5, 7, 10}